6442979 has 2 divisors, whose sum is σ = 6442980. Its totient is φ = 6442978.

The previous prime is 6442939. The next prime is 6442981. The reversal of 6442979 is 9792446.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6442979 is a prime.

It is a Sophie Germain prime.

Together with 6442981, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6442939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3221489 + 3221490.

It is an arithmetic number, because the mean of its divisors is an integer number (3221490).

Almost surely, 2^6442979 is an apocalyptic number.

6442979 is a deficient number, since it is larger than the sum of its proper divisors (1).

6442979 is an equidigital number, since it uses as much as digits as its factorization.

6442979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 6442979 is about 2538.3023854537. The cubic root of 6442979 is about 186.0782324006.

The spelling of 6442979 in words is "six million, four hundred forty-two thousand, nine hundred seventy-nine".